#F-center{
    width: 100%;
    height: 950px;
    background-color: steelblue;
}
#leftF{
    width: 32.1%;
    height: 400px;
    float: left;
    text-align: center;
    overflow: hidden;
    border: 7.5px ridge steelblue;
}
#leftF div{
    width: 100%;
    height: 300px;
    text-align: center;
    margin-top: 330px;
    display: inline-block;
    transition: 0.5s;
    border: 4px ridge steelblue;
    background-color: rgba(135, 206, 235,0);
}
#leftF div .p1{
    color: black;
    text-align: center;
    font-size: 25px;
    font-family: '楷体';
    line-height: 30px;
    background-color: rgb(135, 206, 235);
}
#leftF div .p2{
    padding-left: 10px;
    padding-right: 10px;
    text-align: left;
    font-size: 15px;
    line-height: 30px;
    text-indent: 35px;
    background-color: rgb(135, 206, 235,0);
}
#leftF div:hover{
    margin-top: 150px;
    background-color: rgba(135, 206, 235,0.65);
    transition: 0.5s;
}